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Finding the Fourth Proportional to 15,739.69, 21,720.86 and 8,666.12

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Solution

The fourth proportional to 15,739.69, 21,720.86 and 8,666.12 is: 11,959.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,739.69 : 21,720.86 = 8,666.12 : x
  2. Step 2: Convert to fraction form
    15,739.69/21,720.86 = 8,666.12/x
  3. Step 3: Cross multiply
    15,739.69x = 21,720.86 × 8,666.12
  4. Step 4: Simplify right side
    15,739.69x = 188,235,579.26
  5. Step 5: Solve for x
    x = 188,235,579.26/15,739.69
  6. Step 6: Final answer
    x = 11,959.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.